Starter circuit



June 14, 1955 w. G. CHARLES 2,710,926

STARTER CIRCUIT Filed Feb. 9, 1955 45 Second Yi'me Delay Refay William 6. Char/es IN VEN TOR.

BY WW m United States Patent STARTER CIRCUIT William G. Charles, Chicago, Ill., assignor of twenty-five per cent to Emil F. Autnnovich, and ten per cent to John J. Rumzis, both of Chicago, Ill.

Application February 9, 1953, Serial No. 335,973

2 Claims. (Cl. 290-37) and stop in order to maintain the engine at a certain predetermined temperature. Means are further provided to start and stop the engine so that the internal heat provided by the operating engine will maintain the engine above a predetermined temperature level.

It is to be understood that various other applications 1,.

of this device may be considered to be within the scope of this invention and this starter circuit is equally applicable to heating and refrigerating systems which employ electrical circuits for starting and stopping.

Still further objects of this invention reside in the provision of an electrical circuit for starting and stopping an internal combustion engine in response to a certain preset temperature level, the electrical circuit being simple in construction by including a minimum number of parts, capable of being arranged in a very compact manner, and which is relatively inexpensive to install.

These, together with the various ancillary objects and features of the invention which will become apparent as the following description proceeds, are attained by this starter circuit, a wiring diagram being shown in the figure of the accompanying drawing, by way of example only.

With continuing reference to the accompanying drawings wherein like reference numerals designate similar parts throughout the various views, reference numeral generally designates an actuation switch for the device. This switch 10 is connected in series with a power source such as the 6-volt D. C. battery commonly used in automotive vehicles. A temperature responsive switch 12 such as a thermostat is connected in series with the switch 10 and in series with the solenoid 14 of a double-pole double-throw D. C. relay 16. Hence, with the switch 10 closed and with the temperature at the predetermined temperature level, current will pass through to conductor 18 which is connected to the ignition coil of the internal combustion engine. Further, current will pass through the conductor 20 which is connected to one contact 22 of a single-pole double-throw 6-volt D. C. relay 24.

The D. C. relay 24 has its solenoid actuating mechanism 26 connected in series with the generator 27 driven by the internal combustion engine. The relay 24 is normally urged to a position where the contact 22 is engaged. Current will pass through the relay and through conductor 28 to another single-pole double-throw relay 30. The conductor 28 is further connected through the conductor 32 to one contact 34 of a ten second time delay relay 36. The solenoid actuating mechanism 38 of the 2,710,926 Patented June 14, 1955 relay is electrically connected to the other contact of the time delay relay 36. The heater 42 of the relay 36 is connected to one contact 44 of the relay 30. Another contact 48 of the relay 30 is connected to the starter motor 50 of the internal combustion engine. The relay 30 is normally urged to a circuit closed position through the contact 44 to the heater 42 of the time delay relay 36. Current is applied across the contacts 34 and 40 which are closed when the heater 42 has been actuated. When these contacts are closed the solenoid 38 is actuated to close a circuit through contact 48 so as to activate the starter motor 50. When the internal combustion engine starts, the generator 27 will start delivering current so as to activate the solenoid 26 thus breaking the circuit to starter motor 50.

There is connected in parallel with the relay 30 a forty-five second time delay relay 52. If the starter 50 does not succeed in starting the internal combustion engine the time delay relay 52 will short circuit the system blowing fuse 54 which is connected in series with the source of power. If the internal combustion engine does start it will remain in operation until the thermostat 12 is actuated to break the circuit to the ignition coil to stop the engine.

Since from the foregoing, the construction and advantages of this starter circuit are readily apparent, further description is believed to be unnecessary.

However, since numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may be readily resorted to as desired.

What is claimed as new is as follows:

1. A starter circuit for operating an internal combustion engine to maintain a preset temperature level, said internal combustion engine being provided with an ignition circuit and a starting motor for starting the internal combustion engine, said starter circuit comprising a temperature responsive switch interconnecting said ignition circuit of said internal combustion engine with a first time delay relay, said first time delay relay interconnecting said ignition circuit and said starting motor of said internal combustion engine with a source of electrical power, a fuse between said source of power and said temperature responsive switch, a short circuiting time delay relay interconnected between said starting motor and said source of electrical power, and means to stop said starting motor after said internal combustion engine has started.

2. A starter circuit for operating an internal combustion engine to maintain a preset temperature level, said internal combustion engine being provided with a generator, an ignition circuit and a starting motor for starting the internal combustion engine, said starter circuit comprising a temperature responsive switch interconnecting said ignition circuit with a first relay, a second relay interconnecting said first relay with a third relay, said second relay normally being in a circuit closed position and being controlled to a circuit open position by current generated by said generator after said internal combustion engine has been started, a first time delay relay interconnecting said third relay with said starting motor and said ignition circuit and said starting motor with a source of electrical power, a fuse between said source of power and said temperature responsive switch, a short circuiting time delay relay interconnected between said starting motor and said source of electrical power, and means to stop said starting motor after said internal combustion engine has started.

(References on following page) 4 References Cited in t lie file of this patent 2,197,726 7 Johnson Apr. 16, 1940 UNITED STATES PATENTS ,298 Merritt Aug. 5, 1952 Re. 23,340 Lincoln Feb. 13, 1951 FOREIGN PATENTS lberly g 475,130 Great Britain Nov. 15, 1937 1:932:064 08351 1 1JQYIIIIII.0 25 24, 1933 OTHER REFERENCES 1,992,568 Connor Feb. 26, 1935 Cramer 65,705 (abstract), published Jan. 31, 1950. 2,144,786 Baer et a1 Jan. 24, 1939 

